<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>
    // 赋值运算符
    let username = 'hsylient'

    // 用 === 而不要用 ==
    console.log(3 === 3)
    console.log('c' > 'a')
    console.log(true && true)


</script>
</body>
</html>